CN104730456A - Method for testing the energy saving ratio of asynchronous motor under fluctuating load - Google Patents
Method for testing the energy saving ratio of asynchronous motor under fluctuating load Download PDFInfo
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Abstract
The invention discloses a method for testing the energy saving ratio of an asynchronous motor under a fluctuating load. In the method, the asynchronous motor is powered by a power supply and drives the fluctuating load, an integrated power monitoring instrument detects the voltage of the power supply and detects the operation current of the asynchronous motor through a current transformer, and an operation unit is connected with the integrated power monitoring instrument through a communication port and calculates the instantaneous power of operation of the asynchronous motor. Considering that the motor may not run in a rated state during detection, the instantaneous power is converted into the instantaneous input power for rated operation according to the operation current, a plurality of sets of data can be acquired at each detection, and the arithmetic mean of each set of data within the range of load rate from 0.7 to 0.8 is solved. The asynchronous motor is detected before and after replacement to obtain the energy saving ratio after asynchronous motor replacement, and the amount of power saved after motor replacement can be worked out according to the operation time of the motor. By adopting the method, the energy saving ratio of an asynchronous motor can be worked out accurately under a fluctuating load, so that the efficiency of motor transformation can be evaluated correctly, and the purpose of saving energy and reducing energy consumption can be achieved.
Description
Technical field
The present invention relates to a kind of method of testing of asynchronous machine fluctuating load fractional energy savings.
Background technology
Motor, as the power source of the various equipment such as blower fan, water pump, compressor, grinding machine, is widely used in the every field such as industry, agricultural, traffic.According to statistics, the power consumption of motor occupies sizable proportion, and its power consumption accounts for 66% of industrial electricity.Therefore, improve the efficiency of motor, actively promote the application of high-efficiency electric motor or energy-saving motor, to the development of the national economy, energy conservation and environmental protection etc., all there is positive facilitation.
Common efficiency motor is replaced by the ultra high efficiency motor that loss is little, efficiency is high, power consumption can be reduced when load is constant, reach the object of energy-conservation of consumption reduction.For energy contract management project, effective metering of electric energy is very important link, the calculating of the assessment of relational system correctional effect and benefit.
Usually obtain according to theoretical algorithm for improved energy saving motor rate at present, namely calculate fractional energy savings according to motor electricity saving amount and theory year power consumption, motor electricity saving amount obtains by following formula:
In formula: the electric efficiency that W is amount of energy saving, P is motor rated power, H is working time in motor year, β is induction-motor load rate, η 1 and η 2 is transformation front and back;
In fact, motor actual efficiency and theoretical efficiency have gap, add the fluctuation of induction-motor load, and under often can not being operated in rated load condition, therefore the actual amount of energy saving of motor may there are differences with theoretical value.
Due to the change of site technique situation, for fluctuating loads such as blower fan and pump classes, curent change is larger, stability bandwidth is sometimes more than 5%, and ultra-high efficient motor on average improves about 3% than the efficiency value of common electric machine, before and after motor is changed, the electric power of being measured a period of time by classic method is compared, deviation is very large, the actual fractional energy savings that front and back changed by motor can not be objectively responded, therefore adopt the fractional energy savings test analysis of classic method to asynchronous machine fluctuating load to there is certain defect, thus fractional energy savings accurately cannot be obtained.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of method of testing of asynchronous machine fluctuating load fractional energy savings, this method overcomes the defect of conventional motors fractional energy savings test, the fractional energy savings of asynchronous machine is accurately obtained under fluctuating load, thus the benefit of correct assessment motor transformation, reach economize energy, reduce the object of energy consumption.
For solving the problems of the technologies described above, the method for testing of asynchronous machine fluctuating load fractional energy savings of the present invention comprises the steps:
Step one, asynchronous machine are by Power supply and drive fluctuating load, synthesis electrical supervising instrument detects supply voltage and detects asynchronous machine running current by current transformer, and arithmetic element connects synthesis electrical supervising instrument by PORT COM and calculates asynchronous machine runs realtime power;
Step 2, synthesis electrical supervising instrument detect real-time current, real-time voltage and the power factor that asynchronous machine runs, and obtain the instantaneous power P of asynchronous machine
1,
（1）
Wherein: I
lfor real-time current, U
lfor real-time voltage, φ are power-factor angle;
Step 3, asynchronous machine does not operate in rated condition when considering test, and fluctuation of load change, the real-time current run according to asynchronous machine and rated current, instantaneous power is converted Instantaneous input power P during the specified operation of asynchronous machine
z,
（2）
Wherein: I
nfor the rated current of asynchronous machine;
Step 4, calculate the rate of load condensate β of asynchronous machine by arithmetic element,
(3)
Step 5, the asynchronous machine Instantaneous input power data of extraction rate of load condensate β between 0.7-0.8, Instantaneous input power P during operation specified to asynchronous machine
zcalculate arithmetic mean P
z',
（4）
Wherein: n is the number of times that synthesis electrical supervising instrument detects asynchronous machine instantaneous power;
Step 6, by synthesis electrical supervising instrument to asynchronous machine change before and after detect respectively, try to achieve asynchronous machine change power saving rate:
（5）
Wherein: C% is power saving rate, the P that asynchronous machine is changed
z is old' be arithmetic mean, the P of old asynchronous machine Instantaneous input power
n is new' be the arithmetic mean of new asynchronous machine Instantaneous input power;
Step 7, to be calculated the actual amount of electricity saving △ W that asynchronous machine changes by arithmetic element,
（6）
Wherein:
for the mean value of new and old asynchronous machine rate of load condensate, H are the working time of asynchronous machine.
Further, the fluctuating load of above-mentioned Induction Motor-Driven is blower fan or pump.
Because the method for testing of asynchronous machine fluctuating load fractional energy savings of the present invention have employed technique scheme, namely asynchronous machine drives fluctuating load by Power supply in this method, synthesis electrical supervising instrument detects supply voltage and detects asynchronous machine running current by current transformer, and arithmetic element connects synthesis electrical supervising instrument by PORT COM and calculates asynchronous machine runs instantaneous power; When considering detection, motor may not operate in rated condition, Instantaneous input power when being converted specified operation according to running current, and each detection can obtain multi-group data, all obtains the arithmetic mean of rate of load condensate between 0.7-0.8 to often organizing data; Detect respectively before and after asynchronous machine is changed, try to achieve the power saving rate that asynchronous machine is changed, thus try to achieve the amount of electricity saving after motor replacing according to motor operating time.This method overcomes the defect of conventional motors fractional energy savings test, accurately obtains the fractional energy savings of asynchronous machine under fluctuating load, thus the benefit of correct assessment motor transformation, reach economize energy, reduce the object of energy consumption.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the present invention is described in further detail:
Fig. 1 is the theory diagram of this method asynchronous machine test.
Embodiment
The method of testing of asynchronous machine fluctuating load fractional energy savings of the present invention comprises the steps:
Step one, as shown in Figure 1, asynchronous machine 3 is powered by power supply 1 and is driven fluctuating load 6, synthesis electrical supervising instrument 4 detects power supply 1 voltage and detects asynchronous machine 3 running current by current transformer 2, and arithmetic element 5 is connected synthesis electrical supervising instrument 4 by PORT COM and calculated asynchronous machine 3 runs realtime power;
Step 2, synthesis electrical supervising instrument detect real-time current, real-time voltage and the power factor that asynchronous machine runs, and obtain the instantaneous power P of asynchronous machine
1,
（1）
Wherein: I
lfor real-time current, U
lfor real-time voltage, φ are power-factor angle;
Step 3, asynchronous machine does not operate in rated condition when considering test, and fluctuation of load change, the real-time current run according to asynchronous machine and rated current, instantaneous power is converted Instantaneous input power P during the specified operation of asynchronous machine
z,
（2）
Wherein: I
nfor the rated current of asynchronous machine;
Step 4, calculate the rate of load condensate β of asynchronous machine by arithmetic element,
(3)
Step 5, the asynchronous machine Instantaneous input power data of extraction rate of load condensate β between 0.7-0.8, Instantaneous input power P during operation specified to asynchronous machine
zcalculate arithmetic mean P
z',
（4）
Wherein: n is the number of times that synthesis electrical supervising instrument detects asynchronous machine instantaneous power;
Step 6, by synthesis electrical supervising instrument to asynchronous machine change before and after detect respectively, try to achieve asynchronous machine change power saving rate:
（5）
Wherein: C% is power saving rate, the P that asynchronous machine is changed
z is old' be arithmetic mean, the P of old asynchronous machine Instantaneous input power
n is new' be the arithmetic mean of new asynchronous machine Instantaneous input power;
Step 7, to be calculated the actual amount of electricity saving △ W that asynchronous machine changes by arithmetic element,
（6）
Wherein:
for the mean value of new and old asynchronous machine rate of load condensate, H are the working time of asynchronous machine.
Further, the fluctuating load of above-mentioned Induction Motor-Driven is blower fan or pump.
Common efficiency motor is replaced by the ultra-high efficient motor that loss is little, efficiency is high, power consumption can be reduced when load is constant, reach the object of energy-conservation of consumption reduction.Especially for energy-conservation Guarantee item in energy contract management, effective Quantitative Evaluation of electric energy is very important link, is related to the calculating of system reform recruitment evaluation and transformation benefit.Therefore the fractional energy savings of asynchronous machine under fluctuating load can accurately be obtained by this method, thus the benefit of correct assessment motor transformation, reach economize energy, reduce the object of energy consumption.
Claims (2)
1. a method of testing for asynchronous machine fluctuating load fractional energy savings, is characterized in that this method comprises the steps:
Step one, asynchronous machine are by Power supply and drive fluctuating load, synthesis electrical supervising instrument detects supply voltage and detects asynchronous machine running current by current transformer, and arithmetic element connects synthesis electrical supervising instrument by PORT COM and calculates asynchronous machine runs realtime power;
Step 2, synthesis electrical supervising instrument detect real-time current, real-time voltage and the power factor that asynchronous machine runs, and obtain the instantaneous power P of asynchronous machine
1,
（1）
Wherein: I
lfor real-time current, U
lfor real-time voltage, φ are power-factor angle;
Step 3, asynchronous machine does not operate in rated condition when considering test, and fluctuation of load change, the real-time current run according to asynchronous machine and rated current, instantaneous power is converted Instantaneous input power P during the specified operation of asynchronous machine
z,
（2）
Wherein: I
nfor the rated current of asynchronous machine;
Step 4, calculate the rate of load condensate β of asynchronous machine by arithmetic element,
(3)
Step 5, the asynchronous machine Instantaneous input power data of extraction rate of load condensate β between 0.7-0.8, Instantaneous input power P during operation specified to asynchronous machine
zcalculate arithmetic mean P
z',
（4）
Wherein: n is the number of times that synthesis electrical supervising instrument detects asynchronous machine instantaneous power;
Step 6, by synthesis electrical supervising instrument to asynchronous machine change before and after detect respectively, try to achieve asynchronous machine change power saving rate:
（5）
Wherein: C% is power saving rate, the P that asynchronous machine is changed
z is old' be arithmetic mean, the P of old asynchronous machine Instantaneous input power
n is new' be the arithmetic mean of new asynchronous machine Instantaneous input power;
Step 7, to be calculated the actual amount of electricity saving △ W that asynchronous machine changes by arithmetic element,
（6）
Wherein:
for the mean value of new and old asynchronous machine rate of load condensate, H are the working time of asynchronous machine.
2. the method for testing of asynchronous machine fluctuating load fractional energy savings according to claim 1, is characterized in that, the fluctuating load of described Induction Motor-Driven is blower fan or pump.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259504A (en) * | 2015-11-10 | 2016-01-20 | 东南大学 | An energy efficiency scoring method for a three-phase asynchronous motor system |
| CN108872850A (en) * | 2017-10-25 | 2018-11-23 | 中国石油化工股份有限公司 | A kind of electrical machine energy-saving key technology test platform |
| CN110410955A (en) * | 2019-07-22 | 2019-11-05 | 广东美的制冷设备有限公司 | Control method, device, air conditioner and the storage medium of stepper motor |
| RU2712741C1 (en) * | 2019-04-10 | 2020-01-31 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" | Loading method of asynchronous motor during its testing by mutual load method |
| CN115951725A (en) * | 2023-02-03 | 2023-04-11 | 广州港股份有限公司 | Method and system for controlling delivery flow of mechanized horizontal warehouse |
| CN116990583A (en) * | 2023-07-28 | 2023-11-03 | 上海大速科技有限公司 | Three-phase asynchronous motor with actual output power detection feedback function |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259504A (en) * | 2015-11-10 | 2016-01-20 | 东南大学 | An energy efficiency scoring method for a three-phase asynchronous motor system |
| CN105259504B (en) * | 2015-11-10 | 2018-01-16 | 东南大学 | A kind of efficiency detection method of threephase asynchronous system |
| CN108872850A (en) * | 2017-10-25 | 2018-11-23 | 中国石油化工股份有限公司 | A kind of electrical machine energy-saving key technology test platform |
| RU2712741C1 (en) * | 2019-04-10 | 2020-01-31 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" | Loading method of asynchronous motor during its testing by mutual load method |
| CN110410955A (en) * | 2019-07-22 | 2019-11-05 | 广东美的制冷设备有限公司 | Control method, device, air conditioner and the storage medium of stepper motor |
| CN115951725A (en) * | 2023-02-03 | 2023-04-11 | 广州港股份有限公司 | Method and system for controlling delivery flow of mechanized horizontal warehouse |
| CN115951725B (en) * | 2023-02-03 | 2023-11-21 | 广州港股份有限公司 | Method and system for controlling discharging flow of mechanized horizontal warehouse |
| CN116990583A (en) * | 2023-07-28 | 2023-11-03 | 上海大速科技有限公司 | Three-phase asynchronous motor with actual output power detection feedback function |
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Address after: No. 3520 Tongji Road, Baoshan District, Shanghai, 201900 Patentee after: Baowu equipment Intelligent Technology Co., Ltd Address before: 201900, 335, Pu Pu Road, Shanghai, Baoshan District Patentee before: SHANGHAI BAOSTEEL INDUSTRY TECHNOLOGICAL SERVICE Co.,Ltd. |
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